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Rare bleeding disorders are caused by genetic mutations in the genes required for blood coagulation. Haemophilia A and B are caused by deficiencies of factor VIII (FVIII) and factor IX (FIX), respectively. Together, they have a prevalence of 1 in 3333 at birth. 1 Diagnosis and treatment vary widely throughout the world, mostly reflecting the socioeconomic status of the countries. In low-income countries, most patients are undiagnosed, and many die prematurely due to the lack of treatment.

This is the first published report of the incidence of unexpected DBMV among healthy pediatric patients.

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